. >> and a new un climate change report out says sea level could be prizing -- rising faster than thought. that is especially troubling for those of us living and working near the edge of the bay. and more on the flooding dangers that could be around the corner. >> at high tide this submerged staircase is an erie reminder of the inches separating dry land from water. in 2008 bay waters flooded streets and sidewalks like they did in twut. the united nationspfip level sea levels are rising faster than predicted. >> today's flood going to be tomorrow's high tides. and so we need to get ready for changes, a deeper bay. a bay with bigger waves and more7?s8$ frequent flooding. >> the bay conservation and development commission is in charge of making these maps showing areas in danger of flooding. but now, maybe sooner with models of the un report that now account for melting perma froth. >> san francisco water front will be the last parts of the bay shore to flood. regulators caution if walls aren't built along the bay area shore line, communities can line up underwater. >> communities like fo